JP6868389B2 - 半導体基板および電子デバイス - Google Patents
半導体基板および電子デバイス Download PDFInfo
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- JP6868389B2 JP6868389B2 JP2016252382A JP2016252382A JP6868389B2 JP 6868389 B2 JP6868389 B2 JP 6868389B2 JP 2016252382 A JP2016252382 A JP 2016252382A JP 2016252382 A JP2016252382 A JP 2016252382A JP 6868389 B2 JP6868389 B2 JP 6868389B2
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- 239000000758 substrate Substances 0.000 title claims description 74
- 239000004065 semiconductor Substances 0.000 title claims description 35
- 239000013078 crystal Substances 0.000 claims description 95
- 150000004767 nitrides Chemical class 0.000 claims description 41
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 230000005669 field effect Effects 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 8
- 125000004429 atom Chemical group 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 6
- 229910021419 crystalline silicon Inorganic materials 0.000 claims description 5
- 125000005842 heteroatom Chemical group 0.000 claims description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 286
- 238000000034 method Methods 0.000 description 17
- 229910002704 AlGaN Inorganic materials 0.000 description 14
- 239000007789 gas Substances 0.000 description 14
- 239000002994 raw material Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 230000001629 suppression Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000005530 etching Methods 0.000 description 7
- 238000002003 electron diffraction Methods 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 125000005843 halogen group Chemical group 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005533 two-dimensional electron gas Effects 0.000 description 3
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Description
良 い。前記窒化物結晶層が、前記素子形成層より前記基板側に位置するバッファ層を有し、前記バッファ層が、前記素子形成層と前記基板との間の応力を打ち消す応力を発生するものであっても良い。前記基板がシリコン基板であり、前記窒化物結晶層が、シリコン原子とIII族原子との反応を抑制する反応抑制層を有しても良い。
図1は、本実施の形態の検査方法で用いる半導体基板100の断面図である。半導体基板100は、基板102と、窒化物結晶層120と、キャップ層140と、を有し、基板102、窒化物結晶層120およびキャップ層140が、基板102、窒化物結晶層120、キャップ層140の順に位置する。窒化物結晶層120は、III族窒化物の単一または複数の結晶層からなる。窒化物結晶層120は、たとえば反応抑制層104、バッファ層106および素子形成層108を有する。
図2は、実施の形態1で説明した半導体基板100に電界効果トランジスタを形成した電子デバイス200の断面図である。電子デバイス200は、基板102、バッファ層106、第1結晶層112、第2結晶層114およびキャップ層140を有する半導体基板に形成され、電界効果トランジスタのゲート構造または窒化物結晶層120(特に2次元電子ガス202が形成される第1結晶層112および第2結晶層114とその界面)に接続される配線構造を有し、ゲート構造または配線構造の高さが、キャップ層140の厚さより小さいものである。なお、接続は機械的接続、物理的接続のみならず電気的接続を含む。
基板102として(111)面を主面とする直径150mmのSiウェハを用い、反応抑制層104、バッファ層106および素子形成層108を形成した。反応抑制層104として、設計厚さ150〜160nmのAlN層を形成した。バッファ層106として、設計厚さ5nmのAlN層(第1層106a)および設計厚さ28nmのAlGaN層(第2層106b)からなるAlN/AlGaN積層構造(二層積層106c)を繰り返し積層して形成した。素子形成層108として、設計厚さ800nmのGaN層(第1結晶層112)および設計厚さ25nmのAlGaN層(第2結晶層114)を形成した。AlGaN層(第2結晶層114)のAl組成は0.25とした。さらに、キャップ層140として、厚さ110nmのSi3N4層を形成した。
Claims (6)
- 基板と、III族窒化物の単一または複数の結晶層からなる窒化物結晶層と、キャップ層と、を有し、
前記基板、前記窒化物結晶層および前記キャップ層が、前記基板、前記窒化物結晶層、前記キャップ層の順に位置し、
前記キャップ層が、結晶性を有するノンドープ窒化シリコン層であり、かつ、5nm以上の厚さを有する
半導体基板。 - 基板と、III族窒化物の単一または複数の結晶層からなる窒化物結晶層と、キャップ層と、を有し、
前記基板、前記窒化物結晶層および前記キャップ層が、前記基板、前記窒化物結晶層、前記キャップ層の順に位置し、
前記窒化物結晶層の前記キャップ層と接する層およびその近傍の層が、電界効果トランジスタの活性層として機能するものであり、
前記キャップ層が、結晶性を有する窒化シリコン層であり、かつ、前記電界効果トランジスタのゲートを埋め込む厚さ以上の厚さを有する
半導体基板。 - 前記窒化物結晶層が、前記キャップ層と接する素子形成層を有し、
前記素子形成層が、第1結晶層および前記第1結晶層よりバンドギャップが大きい第2結晶層を有し、
前記第1結晶層および前記第2結晶層のヘテロ界面近傍に2次元キャリアガスを生成する
請求項1または請求項2に記載の半導体基板。 - 前記窒化物結晶層が、前記素子形成層より前記基板側に位置するバッファ層を有し、
前記バッファ層が、前記素子形成層と前記基板との間の応力を打ち消す応力を発生する
請求項3に記載の半導体基板。 - 前記基板がシリコン基板であり、
前記窒化物結晶層が、シリコン原子とIII族原子との反応を抑制する反応抑制層を有する
請求項4に記載の半導体基板。 - 請求項1から請求項5の何れか一項に記載の半導体基板を用いた電子デバイスであって、
前記電子デバイスが、電界効果トランジスタのゲート構造または前記窒化物結晶層に接続される配線構造を有し、
前記ゲート構造または前記配線構造の高さが、前記キャップ層の厚さより小さい
電子デバイス。
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